Hi Anuj,
With CCM 3.x this setting was only configurable through an enterpirse wide setting. With CCM 4.0 this setting can be set on a line by line basis if you like. Have a look;
Call Forward No Answer Timer
Cisco CallManager 4.x Database configurable, per DN, per cluster. Default is 12 seconds.
Cisco CallManager 3.x Configured through a service parameter. Default is 12 seconds.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00801f3b4e.shtml#t4
Modify the No Answer Ring Duration for the Line - CallManager 4.x
In Cisco CallManager 4.x, a new field named No Answer Ring Duration is added for each individual line. This field is used in conjunction with Call Forward No Answer Timer. This new field sets the timer for how long the phone rings before it gets forwarded. Leave this setting blank to use the value that is set in the Cisco CallManager service parameter, Forward No Answer Timer.
Complete these steps to set the No Answer Ring Duration value in Cisco CallManager:
Log in to CallManager Administration.
Select Device
Select Phone from the drop-down list
Find the specific phone.
Select the specific line.
The Directory Number Configuration page is displayed
Change the value in the No Answer Ring Duration field under the Call Forward and Pickup Settings
Hope this helps!
Rob
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